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Robin Williams killed himself by hanging himself with a belt, the Marin County Sheriff's Office said Tuesday, as it announced the results of a preliminary investigation into the beloved actor's suicide. Mark Matthews reports. (Published Tuesday, Aug. 12, 2014)

Updated at 7:06 AM EDT on Wednesday, Aug 13, 2014

Robin Williams killed himself by hanging himself with a belt, the Marin County Sheriff's Office said Tuesday, as it announced the results of a preliminary investigation into the beloved actor's suicide.

Boyd stressed the findings by Marin County Chief Forensic Pathologist Joseph Cohen were preliminary, and he would not discuss whether the 63-year-old had left behind a message for anyone.

"We are not discussing the note, or a note, at this time," Boyd said.

Boyd also did not know if Williams had taken any drugs or consumed alcohol before he committed "suicide by asphyxia." That information will not be available until a toxicology report is returned.

Boyd recounted a brief timeline of events that led to the shocking discovery.

Williams' wife, Susan Schneider, last saw her husband Sunday at about 10:30 p.m. She retired to one room to go to sleep, and her husband went into another, Boyd said. That was the last time anyone saw him alive. Remembering Robin Williams

It wasn't until the next morning at 11:45 a.m. that Williams' personal assistant knocked on a bedroom door. There was no response, Boyd said. When the assistant went in, Williams' body was seated in a chair and "cool to the touch." The "distraught" assistant called 911 at 11:55 a.m., Boyd said.

Boyd said it's unknown at this point exactly what time Williams killed himself, but the actor was pronounced dead on Monday at 12:02 p.m. when firefighters arrived.